GT my friend Helmuth Zittier flying a Bf 110G-4 with the heavy 2cm's and and the ugly Br 21cm rocket launchers was shot down this date by the rear gunner of a US bg B-17 rear gunner. It was a duel and Helmuth's 110G was getting plastered at long range by three tail gunners as he was closing with one in the in-depth position and although he was scoring heavily with the 2cm's he was closing too rapidly and paid the dues by getting his legs torn up by high cal .50's, time to bail....
ZG 26 lost on 10 of October 43, 10 a/c but claimed 16 bombers. On the previous date the 9th, ZG 1 and 26 claimed 21 bombers but German losses are unclear.
yes the rear position on a US heavy bomber was indeed exciting and dangerous......